<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Pixel snapping position reference</title>
    <style>
      div {
        position: absolute;
        height: 100px;
        width: 100px;
        top: 12px;
        background: red;
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>
